Improve portability of the "runtime" system test

The "runtime" system test currently fails on Windows because it waits
for named to log a message indicating successful startup ("running"),
but that never happens since named on Windows fails to open the
configuration file as its path includes control characters.

Instead of putting control characters in directory names, put them in
the value of the -D command line switch passed to named, which is used
for identifying an instance of named in a process listing and whose
value is completely ignored by named, but still logged.

While a similar check using special characters appears to be working
fine on Windows for the time being, modify it in the same way to avoid
potential future problems on other platforms and make the test cleaner.
66 jobs for !2666 with 1310-improve-portability-of-the-runtime-system-test
detached
Status Job ID Name Coverage
  Precheck
canceled #441623
amd64 linux
🐞:sid:amd64

canceled #441621
amd64 linux
autoreconf:sid:amd64

canceled #441622
amd64 linux
misc:sid:amd64

 
  Build
canceled #441636
amd64 linux
asan:sid:amd64

canceled #441642
amd64 freebsd
clang:freebsd11.3:amd64

canceled #441643
amd64 freebsd
clang:freebsd12.0:amd64

canceled #441644
amd64 openbsd
clang:openbsd6.5:amd64

canceled #441639
amd64 linux
clang:stretch:amd64

canceled #441640
i386 linux
clang:stretch:i386

canceled #441624
amd64 linux
gcc:alpine3.10:amd64

canceled #441635
amd64 linux
gcc:bionic:amd64

canceled #441630
amd64 linux
gcc:buster:amd64

canceled #441625
amd64 linux
gcc:centos6:amd64

canceled #441626
amd64 linux
gcc:centos7:amd64

canceled #441627
amd64 linux
gcc:centos8:amd64

canceled #441633
amd64 linux
gcc:fedora30:amd64

canceled #441628
amd64 linux
gcc:jessie:amd64

canceled #441631
amd64 linux
gcc:sid:amd64

canceled #441632
i386 linux
gcc:sid:i386

canceled #441629
amd64 linux
gcc:stretch:amd64

canceled #441634
amd64 linux
gcc:xenial:amd64

canceled #441646
amd64 windows
msvc:windows:amd64

canceled #441638
amd64 linux
mutexatomics:sid:amd64

canceled #441645
amd64 linux
nolibtool:sid:amd64

canceled #441641
amd64 linux
pkcs11:sid:amd64

canceled #441637
amd64 linux
rwlock:sid:amd64

 
  Unit
canceled #441659
amd64 linux
unit:asan:sid:amd64

canceled #441663
amd64 freebsd
unit:clang:freebsd11.3:amd64

canceled #441664
amd64 freebsd
unit:clang:freebsd12.0:amd64

canceled #441661
amd64 linux
unit:clang:stretch:amd64

canceled #441647
amd64 linux
unit:gcc:alpine3.10:amd64

canceled #441658
amd64 linux
unit:gcc:bionic:amd64

canceled #441653
amd64 linux
unit:gcc:buster:amd64

canceled #441648
amd64 linux
unit:gcc:centos6:amd64

canceled #441649
amd64 linux
unit:gcc:centos7:amd64

canceled #441650
amd64 linux
unit:gcc:centos8:amd64

canceled #441656
amd64 linux
unit:gcc:fedora30:amd64

canceled #441651
amd64 linux
unit:gcc:jessie:amd64

canceled #441654
amd64 linux
unit:gcc:sid:amd64

canceled #441655
i386 linux
unit:gcc:sid:i386

canceled #441652
amd64 linux
unit:gcc:stretch:amd64

canceled #441657
amd64 linux
unit:gcc:xenial:amd64

canceled #441665
amd64 linux
unit:nolibtool:sid:amd64

canceled #441662
amd64 linux
unit:pkcs11:sid:amd64

canceled #441660
amd64 linux
unit:rwlock:sid:amd64

 
  System
canceled #441678
amd64 linux
system:asan:sid:amd64

canceled #441681
amd64 freebsd
system:clang:freebsd11.3:amd64

canceled #441682
amd64 freebsd
system:clang:freebsd12.0:amd64

canceled #441666
amd64 linux
system:gcc:alpine3.10:amd64

canceled #441677
amd64 linux
system:gcc:bionic:amd64

canceled #441672
amd64 linux
system:gcc:buster:amd64

canceled #441667
amd64 linux
system:gcc:centos6:amd64

canceled #441668
amd64 linux
system:gcc:centos7:amd64

canceled #441669
amd64 linux
system:gcc:centos8:amd64

canceled #441675
amd64 linux
system:gcc:fedora30:amd64

canceled #441670
amd64 linux
system:gcc:jessie:amd64

canceled #441673
amd64 linux
system:gcc:sid:amd64

canceled #441674
i386 linux
system:gcc:sid:i386

canceled #441671
amd64 linux
system:gcc:stretch:amd64

canceled #441676
amd64 linux
system:gcc:xenial:amd64

canceled #441683
amd64 linux
system:nolibtool:sid:amd64

canceled #441680
amd64 linux
system:pkcs11:sid:amd64

canceled #441679
amd64 linux
system:rwlock:sid:amd64

 
  Docs
canceled #441684
amd64 linux
docs:sid:amd64

 
  Postcheck
canceled #441686
amd64 linux
cppcheck:gcc:sid:amd64

canceled #441685
amd64 linux
scan-build:buster:amd64